Investigating The Effect of Inter- and Intra-row Spacing on Dry Matter Accumulation and Partitioning in Faba bean

This study was conducted to evaluatethe effects of different inter- and intra-row spacing on the dry matter accumulation and partitioning coefficients in faba bean، Barakat cultivar. Experiment was conducted as factorial in a randomized complete block design with three replications. Factors were inter-row spacing (15، 30، 45 and 60 cm) and intra-row spacing (5، 10 and 15 cm). The plant dry matter accumulation and partitioningwas measured during growing season for stem، leaf، and pod، separately. The results showed that the dry matter accumulation in leaves and stems was as a linear functionduring emergence until pod set stage. In this period، partitioning coefficients to leaves and stems were 0. 26-0. 41 and 0. 58-0. 73، respectively. Dry matter partitioning coefficientfor leaves was 49-61 percentin early growing season that decreased to 28-37 percentin pod set stage. Thecoefficients of partitioning drymatter to stems in these two periods of growing season were 38-49 and 56-71 percent، respectively. These results indicates that the dry matter partitioning to leaves decreases and to stems increases as crop develops in faba bean.